board-status: deal with sanitized paths

Change I9dd8e4027be21363015cd8df9918610e206afce2 replaces
colons with underscores in paths, to improve compatibility of paths.
This breaks any attempt to interpret the timestamp part of the tree
as a timestamp, so revert the change before doing so.

Change-Id: I0e82e4045120700e9b4fcc8c6e54d761068eaea3
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: https://review.coreboot.org/13766
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/board_status/to-wiki/bucketize.sh

@@ -19,7 +19,7 @@ quarterly() {
 
 curr=""
 sort -r -k4 -t/ | while read file; do
-	timestamp=`printf $file | cut -d/ -f4`
+	timestamp=`printf $file | cut -d/ -f4 | tr _ :`
 	new=`$1 $timestamp`
 	if [ "$new" != "$curr" ]; then
 		if [ "$curr" != "" ]; then